package com.gzist.elderlyserviceplatform.utils;

import com.gzist.elderlyserviceplatform.config.MinioConfig;
import com.gzist.elderlyserviceplatform.interceptors.exceptions.FileUploadFailedException;
import io.minio.*;
import io.minio.http.Method;
import io.minio.messages.Bucket;
import io.minio.messages.DeleteError;
import io.minio.messages.DeleteObject;
import io.minio.messages.Item;
import jakarta.annotation.PostConstruct;
import lombok.RequiredArgsConstructor;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartFile;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.*;
import java.util.stream.Collectors;

/**
 * MinIO工具类
 */
@Slf4j
@Component
@RequiredArgsConstructor
public class MinioUtil {

    private final MinioConfig minioConfig;
    private final MinioClient minioClient;

    /******************************  Operate Bucket Start  ******************************/

    /**
     * 启动SpringBoot容器的时候初始化公共Bucket
     * 如果没有公共Bucket则创建并设置为公共访问
     */
    @PostConstruct
    @SneakyThrows(Exception.class)
    private void createPublicBucketIfNotExists() {
        createPublicBucket(minioConfig.getBucketName());
    }

    @SneakyThrows(Exception.class)
    private void createPublicBucket(String bucketName) {
        if (!bucketExists(bucketName)) {
            minioClient.makeBucket(MakeBucketArgs.builder().bucket(bucketName).build());

            // 设置桶为公共访问
            String policyJson = "{\n" +
                    "  \"Version\": \"2012-10-17\",\n" +
                    "  \"Statement\": [\n" +
                    "    {\n" +
                    "      \"Effect\": \"Allow\",\n" +
                    "      \"Principal\": \"*\",\n" +
                    "      \"Action\": \"s3:GetObject\",\n" +
                    "      \"Resource\": \"arn:aws:s3:::" + bucketName + "/*\"\n" +
                    "    }\n" +
                    "  ]\n" +
                    "}";
            minioClient.setBucketPolicy(SetBucketPolicyArgs.builder().bucket(bucketName).config(policyJson).build());
        }
    }

    /**
     * 判断Bucket是否存在，true：存在，false：不存在
     *
     * @param bucketName
     * @return
     */
    @SneakyThrows(Exception.class)
    public boolean bucketExists(String bucketName) {
        log.info("[Minio工具类]>>>> 判断Bucket是否存在，bucketName:{}", bucketName);
        return minioClient.bucketExists(BucketExistsArgs.builder().bucket(bucketName).build());
    }

    /**
     * 获得Bucket的策略
     *
     * @param bucketName
     * @return
     */
    @SneakyThrows(Exception.class)
    public String getBucketPolicy(String bucketName) {
        return minioClient.getBucketPolicy(GetBucketPolicyArgs
                .builder()
                .bucket(bucketName)
                .build());
    }

    /**
     * 获得所有Bucket列表
     *
     * @return
     */
    @SneakyThrows(Exception.class)
    public List<Bucket> getAllBuckets() {
        return minioClient.listBuckets();
    }

    /**
     * 根据bucketName获取其相关信息
     *
     * @param bucketName
     * @return
     */
    @SneakyThrows(Exception.class)
    public Optional<Bucket> getBucket(String bucketName) {
        return getAllBuckets().stream().filter(b -> b.name().equals(bucketName)).findFirst();
    }

    /**
     * 根据bucketName删除Bucket，true：删除成功； false：删除失败，文件或已不存在
     *
     * @param bucketName
     * @throws Exception
     */
    @SneakyThrows(Exception.class)
    public void removeBucket(String bucketName) {
        minioClient.removeBucket(RemoveBucketArgs.builder().bucket(bucketName).build());
    }

    /******************************  Operate Bucket End  ******************************/


    /******************************  Operate Files Start  ******************************/

    /**
     * 判断文件是否存在
     *
     * @param bucketName
     * @param objectName
     * @return
     */
    public boolean isObjectExist(String bucketName, String objectName) {
        boolean exist = true;
        try {
            minioClient.statObject(StatObjectArgs.builder().bucket(bucketName).object(objectName).build());
        } catch (Exception e) {
            log.error("[Minio工具类]>>>> 判断文件是否存在, 异常：", e);
            exist = false;
        }
        return exist;
    }

    /**
     * 判断文件夹是否存在
     *
     * @param bucketName
     * @param objectName
     * @return
     */
    public boolean isFolderExist(String bucketName, String objectName) {
        boolean exist = false;
        try {
            Iterable<Result<Item>> results = minioClient.listObjects(
                    ListObjectsArgs.builder().bucket(bucketName).prefix(objectName).recursive(false).build());
            for (Result<Item> result : results) {
                Item item = result.get();
                if (item.isDir() && objectName.equals(item.objectName())) {
                    exist = true;
                }
            }
        } catch (Exception e) {
            log.error("[Minio工具类]>>>> 判断文件夹是否存在，异常：", e);
            exist = false;
        }
        return exist;
    }

    /**
     * 根据文件前置查询文件
     *
     * @param bucketName 存储桶
     * @param prefix     前缀
     * @param recursive  是否使用递归查询
     * @return MinioItem 列表
     */
    @SneakyThrows(Exception.class)
    public List<Item> getAllObjectsByPrefix(String bucketName,
                                            String prefix,
                                            boolean recursive) {
        List<Item> list = new ArrayList<>();
        Iterable<Result<Item>> objectsIterator = minioClient.listObjects(
                ListObjectsArgs.builder().bucket(bucketName).prefix(prefix).recursive(recursive).build());
        if (objectsIterator != null) {
            for (Result<Item> o : objectsIterator) {
                Item item = o.get();
                list.add(item);
            }
        }
        return list;
    }

    /**
     * 获取文件流
     *
     * @param bucketName 存储桶
     * @param objectName 文件名
     * @return 二进制流
     */
    @SneakyThrows(Exception.class)
    public InputStream getObject(String bucketName, String objectName) {
        return minioClient.getObject(
                GetObjectArgs.builder()
                        .bucket(bucketName)
                        .object(objectName)
                        .build());
    }

    /**
     * 断点下载
     *
     * @param bucketName 存储桶
     * @param objectName 文件名称
     * @param offset     起始字节的位置
     * @param length     要读取的长度
     * @return 二进制流
     */
    @SneakyThrows(Exception.class)
    public InputStream getObject(String bucketName, String objectName, long offset, long length) {
        return minioClient.getObject(
                GetObjectArgs.builder()
                        .bucket(bucketName)
                        .object(objectName)
                        .offset(offset)
                        .length(length)
                        .build());
    }

    /**
     * 获取路径下文件列表
     *
     * @param bucketName 存储桶
     * @param prefix     文件名称
     * @param recursive  是否递归查找，false：模拟文件夹结构查找
     * @return 二进制流
     */
    public Iterable<Result<Item>> listObjects(String bucketName, String prefix, boolean recursive) {
        return minioClient.listObjects(
                ListObjectsArgs.builder()
                        .bucket(bucketName)
                        .prefix(prefix)
                        .recursive(recursive)
                        .build());
    }

    /**
     * 使用MultipartFile进行文件上传
     *
     * @param bucketName  存储桶
     * @param file        文件名
     * @param objectName  对象名
     * @param contentType 类型
     * @return
     */
    @SneakyThrows(Exception.class)
    public ObjectWriteResponse uploadFile(String bucketName, MultipartFile file, String objectName, String contentType) {
        InputStream inputStream = file.getInputStream();
        return minioClient.putObject(
                PutObjectArgs.builder()
                        .bucket(bucketName)
                        .object(objectName)
                        .contentType(contentType)
                        .stream(inputStream, inputStream.available(), -1)
                        .build());
    }

    /**
     * 图片上传
     *
     * @param bucketName
     * @param imageBase64
     * @param imageName
     * @return
     */
    public ObjectWriteResponse uploadImage(String bucketName, String imageBase64, String imageName) {
        if (!StringUtils.isEmpty(imageBase64)) {
            InputStream in = base64ToInputStream(imageBase64);
            String newName = System.currentTimeMillis() + "_" + imageName + ".jpg";
            String year = String.valueOf(new Date().getYear());
            String month = String.valueOf(new Date().getMonth());
            return uploadFile(bucketName, year + "/" + month + "/" + newName, in);
        }
        return null;
    }

    /**
     * Base64转输入流（JDK17+兼容方案）
     * 修改说明：
     * 1. 移除sun.misc.BASE64Decoder的依赖
     * 2. 使用java.util.Base64标准类代替
     * 3. 增加Base64头信息过滤逻辑
     */
    public static InputStream base64ToInputStream(String base64) {
        try {
            String cleanBase64 = base64.trim()
                    .replaceAll("^data:[^;]+;base64,", "")
                    .replaceAll("\\s+", "");

            // 使用JDK标准Base64解码
            byte[] bytes = Base64.getDecoder().decode(cleanBase64);
            return new ByteArrayInputStream(bytes);
        } catch (Exception e) {
            log.error("Base64转换异常：", e);
            throw new FileUploadFailedException("Base64格式转换失败: " + e.getMessage());
        }
    }


    /**
     * 上传本地文件
     *
     * @param bucketName 存储桶
     * @param objectName 对象名称
     * @param fileName   本地文件路径
     * @return
     */
    @SneakyThrows(Exception.class)
    public ObjectWriteResponse uploadFile(String bucketName, String objectName, String fileName) {
        return minioClient.uploadObject(
                UploadObjectArgs.builder()
                        .bucket(bucketName)
                        .object(objectName)
                        .filename(fileName)
                        .build());
    }

    /**
     * 通过流上传文件
     *
     * @param bucketName  存储桶
     * @param objectName  文件对象
     * @param inputStream 文件流
     * @return
     */
    @SneakyThrows(Exception.class)
    public ObjectWriteResponse uploadFile(String bucketName, String objectName, InputStream inputStream) {
        return minioClient.putObject(
                PutObjectArgs.builder()
                        .bucket(bucketName)
                        .object(objectName)
                        .stream(inputStream, inputStream.available(), -1)
                        .build());
    }

    /**
     * 创建文件夹或目录
     *
     * @param bucketName 存储桶
     * @param objectName 目录路径
     * @return
     */
    @SneakyThrows(Exception.class)
    public ObjectWriteResponse createDir(String bucketName, String objectName) {
        return minioClient.putObject(
                PutObjectArgs.builder()
                        .bucket(bucketName)
                        .object(objectName)
                        .stream(new ByteArrayInputStream(new byte[]{}), 0, -1)
                        .build());
    }

    /**
     * 获取文件信息, 如果抛出异常则说明文件不存在
     *
     * @param bucketName 存储桶
     * @param objectName 文件名称
     * @return
     */
    @SneakyThrows(Exception.class)
    public String getFileStatusInfo(String bucketName, String objectName) {
        return minioClient.statObject(
                StatObjectArgs.builder()
                        .bucket(bucketName)
                        .object(objectName)
                        .build()).toString();
    }

    /**
     * 拷贝文件
     *
     * @param bucketName    存储桶
     * @param objectName    文件名
     * @param srcBucketName 目标存储桶
     * @param srcObjectName 目标文件名
     */
    @SneakyThrows(Exception.class)
    public ObjectWriteResponse copyFile(String bucketName, String objectName, String srcBucketName, String srcObjectName) {
        return minioClient.copyObject(
                CopyObjectArgs.builder()
                        .source(CopySource.builder().bucket(bucketName).object(objectName).build())
                        .bucket(srcBucketName)
                        .object(srcObjectName)
                        .build());
    }

    /**
     * 删除文件
     *
     * @param bucketName 存储桶
     * @param objectName 文件名称
     */
    @SneakyThrows(Exception.class)
    public void removeFile(String bucketName, String objectName) {
        minioClient.removeObject(
                RemoveObjectArgs.builder()
                        .bucket(bucketName)
                        .object(objectName)
                        .build());
    }

    /**
     * 批量删除文件
     *
     * @param bucketName 存储桶
     * @param keys       需要删除的文件列表
     * @return
     */
    public void removeFiles(String bucketName, List<String> keys) {
        List<DeleteObject> objects = new LinkedList<>();
        keys.forEach(s -> {
            objects.add(new DeleteObject(s));
            try {
                removeFile(bucketName, s);
            } catch (Exception e) {
                log.error("[Minio工具类]>>>> 批量删除文件，异常：", e);
            }
        });
    }

    /**
     * 获取文件外链
     *
     * @param bucketName 存储桶
     * @param objectName 文件名
     * @param expires    过期时间 <=7 秒 （外链有效时间（单位：秒））
     * @return url
     */
    @SneakyThrows(Exception.class)
    public String getPresignedObjectUrl(String bucketName, String objectName, Integer expires) {
        GetPresignedObjectUrlArgs args = GetPresignedObjectUrlArgs.builder().expiry(expires).bucket(bucketName).object(objectName).build();
        return minioClient.getPresignedObjectUrl(args);
    }

    /**
     * 获得文件外链
     *
     * @param bucketName
     * @param objectName
     * @return url
     */
    @SneakyThrows(Exception.class)
    public String getPresignedObjectUrl(String bucketName, String objectName) {
        GetPresignedObjectUrlArgs args = GetPresignedObjectUrlArgs.builder()
                .bucket(bucketName)
                .object(objectName)
                .method(Method.GET).build();
        return minioClient.getPresignedObjectUrl(args);
    }

    /**
     * 将URLDecoder编码转成UTF8
     *
     * @param str
     * @return
     * @throws UnsupportedEncodingException
     */
    public String getUtf8ByURLDecoder(String str) throws UnsupportedEncodingException {
        String url = str.replaceAll("%(?![0-9a-fA-F]{2})", "%25");
        return URLDecoder.decode(url, "UTF-8");
    }

///////////////////////// 分片上传相关方法 //////////////////////////////////////////

    /**
     * 分片上传（兼容旧版SDK）
     *
     * @param bucketName  存储桶
     * @param objectName  对象名
     * @param inputStream 输入流
     * @param chunkSize   分片大小
     */
    @SneakyThrows(Exception.class)
    public void uploadChunk(String bucketName,
                            String objectName,
                            InputStream inputStream,
                            long chunkSize) {
        minioClient.putObject(
                PutObjectArgs.builder()
                        .bucket(bucketName)
                        .object(objectName)
                        .stream(inputStream, chunkSize, -1)
                        .build());
    }

    /**
     * 合并分片（通过组合对象实现）
     *
     * @param bucketName   存储桶
     * @param chunkObjects 分片对象列表
     * @param targetObject 合并后的对象名
     */
    @SneakyThrows(Exception.class)
    public void composeChunks(String bucketName,
                              List<String> chunkObjects,
                              String targetObject) {
        List<ComposeSource> sources = new ArrayList<>();
        for (String object : chunkObjects) {
            sources.add(ComposeSource.builder()
                    .bucket(bucketName)
                    .object(object)
                    .build());
        }

        minioClient.composeObject(
                ComposeObjectArgs.builder()
                        .bucket(bucketName)
                        .object(targetObject)
                        .sources(sources)
                        .build());
    }

    /**
     * 列出指定前缀的所有对象
     *
     * @param bucketName 存储桶
     * @param prefix     前缀
     */
    @SneakyThrows(Exception.class)
    public List<String> listChunkObjects(String bucketName, String prefix) {
        List<String> objects = new ArrayList<>();
        Iterable<Result<Item>> results = minioClient.listObjects(
                ListObjectsArgs.builder()
                        .bucket(bucketName)
                        .prefix(prefix)
                        .recursive(true)
                        .build());

        for (Result<Item> result : results) {
            objects.add(result.get().objectName());
        }
        return objects;
    }

    /**
     * 批量删除对象（增强版）
     *
     * @param bucketName  存储桶
     * @param objectNames 对象列表
     */
    @SneakyThrows(Exception.class)
    public void removeObjects(String bucketName, List<String> objectNames) {
        // 转换为DeleteObject列表
        List<DeleteObject> deleteObjects = objectNames.stream()
                .map(DeleteObject::new)
                .collect(Collectors.toList());

        // 执行批量删除
        Iterable<Result<DeleteError>> results = minioClient.removeObjects(
                RemoveObjectsArgs.builder()
                        .bucket(bucketName)
                        .objects(deleteObjects)
                        .build()
        );

        // 检查删除结果
        for (Result<DeleteError> result : results) {
            DeleteError error = result.get();
            if (error != null) {
                throw new FileUploadFailedException("分片删除失败: " + error.objectName());
            }
        }
    }

    /**
     * 获取MinIO存储中指定对象的大小
     *
     * @param bucketName 存储桶名称，用于标识对象所在的存储容器
     * @param objectName 对象名称，指存储在存储桶中的完整文件路径
     * @return 对象大小（单位：字节），通过MinIO服务端元数据获取
     * @throws Exception 当对象不存在、访问权限不足或网络通信异常时抛出
     */
    public Long getObjectSize(String bucketName, String objectName) throws FileUploadFailedException {
        try {
            return minioClient.statObject(
                    StatObjectArgs.builder()
                            .bucket(bucketName)
                            .object(objectName)
                            .build()
            ).size();
        } catch (Exception e) {
            log.error("获取对象大小失败：{}", objectName, e);
            throw new FileUploadFailedException("获取对象尺寸失败: " + e.getMessage());
        }
    }

}
